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  1. GN7 On the Dyno
    I have always gone with the old rule of .004 per inch of bore which would put me at a gap of .0018. This mild N/A mild engine. Any thoughts?
  2. Parts for Sale
    Edelbrock 7561 Air gap manifold, like new used condition...motor was in the boat for 5hrs $150 plus ride
  3. Jet Boats
    I'm putting together a Gen 5 454 Chevy. Last spring I picked up this boat that was stored in a warehouse and the building caught fire. Only reason I jumped on it was because the engine and pump only had 40hrs on them. Sold the pump so the endeavor pretty much paid for itself. I was going to...
  4. Parts for Sale
    Looking for a Air-Gap for a BBF 460, Any out there? please email to [email protected] Thanks Pat
  5. V-Drives
    Hi, I just got a smart phone and I'm trying to do this on the phone, so sorry if it comes out miss spelled , my question is about my rpm air gap intake And my ski tow, the directions on the intake specifically say not to torque certain intake bolts because it could damage the intake, it says...
  6. GN7 On the Dyno
    OK, have to install a new set of rings on the piston in my son's boat that got took out, BBC, 0.60 over, what should I set to gaps at?, Need to do this tomorrow morning, help!!!!!!!
  7. GN7 On the Dyno
    I was gapping rings today for a 540 BBC, SRP pistons. Top rings are 24 and some how I gapped my second rings at 35. I dropped a feeler guage and grabbed the wrong one with out my glasses on. Question is will it work or should I just throw another 100 away and get another set. I like the...
  8. GN7 On the Dyno
    Anyone here play with spark gap while dyno testing? I'm in the market for a new distributer for my mild carbed Vortec SBC. I see some claims from companies such as DUI and ChevPro Marine that their HEI set-ups with 50,000 volts will increase horsepower on the order of 15+ because it allows for...
  9. PB Open Water
    Women, I'm interested in why you voted the way you did. We have a shortage of women in the PRF. If you voted, please respond in the PRF Gender Gap thread with your reasoning. If you wish to remain anonymous, you can PM me and I'll paste up your comments without your name. Thanks.
  10. GN7 On the Dyno
    I have a 1974 454 BBC, 750 holley carb, lighting headers, maybe a mild cam in it. im putting new plugs in it. What is the spark plug gap distance?
  11. GN7 On the Dyno
    Unsure what to gap the plugs. 540tall deck 793HP chevy aluminum head pump gas MSD 6al unsure of compression ratio.
  12. Parts for Sale
    I'm looking for a 429/460 RPM Air Gap to replace the SCJ intake on the 21.
  13. GN7 On the Dyno
    I know a guy with a BBC 396 with a Vortex mag and am curious as to what the plug gap should be set at. Right now its at 18 (at the recommendation of a friend). What do you guys say? Fuel is usually around 100 octane and the boat has a 150 shot of nitrous.
  14. GN7 On the Dyno
    Had a bad leakdown on 2 cylinders. 4-8. Pulled the motor down today and the top and second ring gaps are almost aligned on those two cylinders. Anybody got any ideas on why this happened and what to do to stop it. 509 chevy. Dart block. Je pistons and rings
  15. GN7 On the Dyno
    I have a vertex mag, the engine is a 440 mopar, 11 to 1 compression, it has a tunnel ram with 2 750 holleys. What should the plugs be gapped? The boat is a hondo flat bottom v drive.
  16. GN7 On the Dyno
    getting a couple different answers from people on what i should gap my plugs to its a blown bbc with a mag and 10lbs a boost spinning 6800. any ideas? thanks in advance
  17. Jet Boats
    Why does Timinator reccomend top gap at 0.022 and second ring at 0.018" when everyone else reccomends larger gap on second ring than the top ring. Is this a typo or is there a reason?
  18. GN7 On the Dyno
    I figure this ought to be fun. What is the proper way to gap spark plugs? Do you use the screwdriver and hammer on the fender method? Feeler gauges, or the round wire gauges? Or the single round disc piece of crap. Does it really matter? (to mag guys if course it does cause they hardly spark)...
  19. Jet Boats
    I searched a little but couldn't find a definite answer. When making a firewall or forward support under the bow does there need to be a gap between the floor and ceiling of the bow for flex? Or can you just glass the bottom of the firewall to the floor and the top to the ceiling of it? I'd like...
  20. PB Open Water
    Anyone have a manual to tell the plug gaps on a 1990 5.7 w Thunderbolt ignition, and a 1987 454 with the same ignition, I allready know the plug is a 43 delco...thanks:D
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